What did the thrush have to do with Bilbo being able to find a way to open the secret door? I think it's because he heard a crack and it was the thrush cracking the snail. Then Bilbo saw the ray of light. I think it's that, but I just want to be sure. Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do. If you haven't found it yet, keep looking. Don't settle.

Makes perfect sense. You see I completely forgot what the moon letters said and was a little confused why the thrush made Bilbo so excited. Thanks for the help. Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do. If you haven't found it yet, keep looking. Don't settle.